package com.didi.gulimall.interceptor;

import com.didi.gulimall.cart.vo.UserInfoTo;
import com.didi.gulimall.common.constant.AuthServerConstant;
import com.didi.gulimall.common.constant.CartConstant;
import com.didi.gulimall.common.constant.SystemConstant;
import com.didi.gulimall.common.to.MemberResponseVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @author 10626
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     * 目标方法执行之前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {
        HttpSession session = request.getSession();
        UserInfoTo userInfoTo = new UserInfoTo();
        MemberResponseVo loginUser = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (loginUser != null) {
            userInfoTo.setUserId(loginUser.getId());
            userInfoTo.setLevelId(loginUser.getLevelId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if (name.equalsIgnoreCase(CartConstant.TEMP_USER_COOKIE_NAME)) {
                    userInfoTo.setTempUser(true);
                    userInfoTo.setUserKey(cookie.getValue());
                }
            }
        }
        if (StringUtils.isBlank(userInfoTo.getUserKey())) {
            String uuid = UUID.randomUUID().toString().replaceAll("-", "");
            userInfoTo.setUserKey(uuid);
        }
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后；分配临时用户，让浏览器保存
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (!userInfoTo.isTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain(SystemConstant.GULIMALL);
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
        threadLocal.remove();
    }
}
